This was the second movie I was going to post in my original thread, but didn't have time to. This movie was featured on Stephen King's This Is Horror on MTV in the 90's. It was made in the 80's I think. The movie shows a man feeding an old woman (possibly his mother) a bunch of pills in the hospital, to help her commit suicide.

Another scene shows the man later on walking in to the elevator, where the same old lady is sitting in a wheelchair with plastic around her. He pulls back the plastic, and she looks okay at first. But when he hugs her, her head falls back sideways and she's dead and green. What was the name of this movie? I want to see if I can find it and watch it.

Stephen King wrote a short story in his book Night Shift called The Woman In The Room in which a loving son attempts to take his terminally ill mother out of her pain by assisting in her suicide. This might be the one you're thinking of.